.box {
  width: 100%;
  display: flex;
  justify-content: flex-start;
  flex-wrap: wrap;
  padding: 30px;
}
.app-exam-item{
  flex: 1
}
.card {
  height: auto;
  flex: 0 0 310px;
  margin: 10px;
}

:host {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}
